﻿NORTH AMERICAN SPHINGIDiE. 129 



1. S. diffinis. — Sphinx fusiformis Abbot & Smith, I. p. 85, pi. 43. Macroglossa diffinis Boisd. N. II. 

 Ins. Lep. I. pi. 15, f. 2. Sesia diffinis, Harris, p. 308, 2. 



Head and thorax pale yellowish green ; palpi blackish terminally and pale yellow beneath ; breast pale 

 yellow, with blackish hairs beneath the legs, and all the legs black. The abdomen adjoining the thorax has the 

 thoracic hue ; the third and fourth segments, sometimes only the fourth, are black or blackish along the sides 

 of the four first anterior rings, and the fifth and sixth are pale brownish mixed with yellow. The ventral 

 surface is bluish black, with pale yellow patches corresponding to the tufts on the margins of the fifth and 

 sixth segments. The lateral anal tufts are black, the central pale brown. The disc of the anterior wings 

 is transparent almost to the base, with a narrow, dark brownish border along the costa, a patch on the 

 inner margin tapering to the inner angle, and a narrow terminal border in the % , but rather broad and 

 dentate between the nervules in the 9, of the same hue; a ferruginous patch on the apical interspace, 

 sometimes followed by a smaller one in the succeeding, in the 9 . The posterior wings are bordered with 

 dark brown on the costa near the base, broadly on the inner margin, the terminal margin in the £ very 

 narrow, and moderate in the 9 . 



There are variations in color ; sometimes the thorax is fawn-colored above and somewhat ochreous 

 beneath : the abdomen fawn-colored at the base, the two middle segments dark reddish brown, the ends 

 and sides blackish and the two terminal rings fawn-color above, with two large yellow patches on the 

 ventral surface which is black. 



Egg. ? 



Young Larva. ? 



Mature Larva. — Pale pea-green, reddish beneath, with a dark green dorsal line, a pale yellow stigmatal 

 stripe. 



Pupation. ? 



Food-plants. ? 



Geographical distribution. — Canada, Northern and Southern United States. 



Measurements — a male. 



HEAD. 



THORAX. 



ABDOMEN. 



BODY. 



ANT. WING 



Length. Breadth. 



Length. Breadth. 



Length. Breadth' 



Length. 



Length 



1-25 1-75— 1-25 



3-00 3-25 



6-50 3-50 



10-50 



8-75 



2. S. Thysbe.— Sphinx Thysbe Fabr. Syst. Ent. 548, 4; Sp. Lis. II. 155, 10; Mant. Ins. II. 99, 10, 

 Gmel. ed. Syst. Nat. I. 5, 2388, 100. Sesia Thysbe Fabr. Ent. Syst. III. 1, 301, 10. Sphinx 

 Pelasgus, Cramer III. 93, pi. 248, f. B. Sesia Pelasgus Harris, p. 308, 1. Sesia Cimbiciformis Steph. 

 I. p. 135; Wood, pi. 53, f. 29. Sesia Thysbe Walker, p. 82. S. ruficaudis Kirby, IV. 303, 

 Walker, p. 82?* 



*Ruficaudis of Kirby. — " Body yellow olive, underneath pale yellow. Antennas black ; fore wings reddish 

 brown, hyaline in the disk, with the hyaline part half divided towards the base, with a costal bar ; covered 

 with yellow olive hairs at the base underneath the costa, the posterior margin and the nervures are dark 

 ferruginous ; there is also a yellow stripe on the inner side of the base ; hind wings hyaline in the disk, base 

 externally and costa yellow ; internally the base is ferruginous ; underneath the dark part of the wings is 

 ferruginous and the base pale yellow ; two first segments of the abdomen yellow olive, two next black, the 

 rest ferruginous, with pale yellow lateral spots." 



Ruficaudis of Walker. — Fawn-color. Head whitish about the antenna? and beneath, with a brown band in 

 front. Pectus testaceous. Abdomen deep red, fawn-color at the base, with testaceous spots along each 

 side ; hind borders of segments black ; apical tuft red, with some black hairs on each side. Wings limpid, 

 deep red at the base, and with broad deep red borders. Fore wings deep red at the tips and with a blackish 

 diseal streak. Length of the body 9 — 12 lines ; of the wings 18— 24 lines. 



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